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Showing content from https://ruby-syntax-tree.github.io/syntax_tree/SyntaxTree/BEGINBlock.html below:

class SyntaxTree::BEGINBlock - RDoc Documentation

1. SyntaxTree::
2. BEGINBlock

BEGINBlock represents the use of the BEGIN keyword, which hooks into the lifecycle of the interpreter. Whatever is inside the block will get executed when the program starts.

BEGIN {
}

Interestingly, the BEGIN keyword doesn’t allow the do and end keywords for the block. Only braces are permitted.

LBrace

the left brace that is seen after the keyword

def initialize(lbrace:, statements:, location:)
  @lbrace = lbrace
  @statements = statements
  @location = location
  @comments = []
end

def ===(other)
  other.is_a?(BEGINBlock) && lbrace === other.lbrace &&
    statements === other.statements
end

def accept(visitor)
  visitor.visit_BEGIN(self)
end

def child_nodes
  [lbrace, statements]
end

def copy(lbrace: nil, statements: nil, location: nil)
  node =
    BEGINBlock.new(
      lbrace: lbrace || self.lbrace,
      statements: statements || self.statements,
      location: location || self.location
    )

  node.comments.concat(comments.map(&:copy))
  node
end

def deconstruct_keys(_keys)
  {
    lbrace: lbrace,
    statements: statements,
    location: location,
    comments: comments
  }
end

def format(q)
  q.group do
    q.text("BEGIN ")
    q.format(lbrace)
    q.indent do
      q.breakable_space
      q.format(statements)
    end
    q.breakable_space
    q.text("}")
  end
end

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